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Vertical antenna balloon for the 80m band
The antenna could not be simpler - 1/4 or 1/2 wavelength of thin copper wire, used 35 SWG enamalled copper wire. This amounts to 20 or 40m of wire. It is carefully coiled up on the wire spool with one end soldered to a tag. When the balloon is let free it pulls the wire from the spool and it goes up at a nice slow pace. Once up, a croc-clip goes from the ATU coil to the solder tag - the antenna is connected
post 13 May 2024
Antenna 80 meter Links →
80 Meter Tower Vertical with Short Radials
The modelled resistance component of the feed point impedance at 3.65 MHz is 80 ohm. It is high due to ground loss and being well off resonance. I chose to simply place a capacitor load in series with tower monopole, chosen to have a reactance of equal magnitude to the inductive reactance of 44 ohm at 3.65 MHz. This requires a capacitor of 1000 pf
Single Support Gain Antennasfor 80 and 160 Meters
Examples of antenna ,Sloper Arrays, having a tower
Dual Band Antenna 40-80m
PVC Diameter 50mm, total coil turns 78, wire 1.25 mm, for PVC size Diameter 42mm (1 1/4′) the number of turns 89 turns around 100uh
Dipolo rigido nvis 40-80m
Dipolo caricato sulle bande dei 40m-80m
Skyloop Antenna 3.5 to 50 MHz
I decided to try a new type of hf antenna skyloop or deltaloop
78
The modelled resistance component of the feed point impedance at 3.65 MHz is 80 ohm. It is high due to ground loss and being well off resonance. I chose to simply place a capacitor load in series with tower monopole, chosen to have a reactance of equal magnitude to the inductive reactance of 44 ohm at 3.65 MHz. This requires a capacitor of 1000 pf
Examples of antenna ,Sloper Arrays, having a tower
PVC Diameter 50mm, total coil turns 78, wire 1.25 mm, for PVC size Diameter 42mm (1 1/4′) the number of turns 89 turns around 100uh
Dipolo caricato sulle bande dei 40m-80m
I decided to try a new type of hf antenna skyloop or deltaloop
Antenna switch arduino for icom IC-7300 A solution built around an arduino nano and one of the readily available four relay switching boards
Satellite Antenna Rotator Controller and TRACker ARCTRAC is a portable integrated satellite tracking system
Duplexer 2m-70cm- Usare un'antenna bibanda 2/70 con due radio separate V/UHF, usare due antenne separate V/UHF con una singola radio bibanda